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Is setprototypeof ESM-only? Can you require() it?

A small polyfill for Object.setprototypeof

Last verified Sep 9, 2026 against setprototypeof@1.2.0. JSON

CommonJS CommonJS — require() works on every Node.js version

setprototypeof ships CommonJS only. require("setprototypeof") works everywhere. import "setprototypeof" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Latest
1.2.0 (Jul 18, 2019)
Module format
CommonJS
Last CommonJS version
1.2.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
92.0M
License
ISC

Does setprototypeof@1.2.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("setprototypeof") from a CommonJS file and import "setprototypeof" from an ES module.

Runtimerequire("setprototypeof")import "setprototypeof"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4✓ works✓ works

How to import setprototypeof

ES modules (import)

import setprototypeof from "setprototypeof";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const setprototypeof = require("setprototypeof");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (7 versions; the newest 7 shown).

VersionsFormatFirst published
1.0.0 – 1.2.0CommonJSFeb 4, 2015

Frequently asked

Is setprototypeof ESM-only?

setprototypeof@1.2.0 is a CommonJS package. setprototypeof ships CommonJS only. require("setprototypeof") works everywhere. import "setprototypeof" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import setprototypeof with ES module syntax?

Yes. import setprototypeof from "setprototypeof" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does setprototypeof work in Bun?

Yes. import "setprototypeof" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does setprototypeof ship TypeScript types?

Yes. setprototypeof bundles its own type declarations; no @types package is needed.

Links

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